Race condition when clietn and namenode start block recovery simultaneously
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                 Key: HADOOP-3503
                 URL: https://issues.apache.org/jira/browse/HADOOP-3503
             Project: Hadoop Core
          Issue Type: Bug
          Components: dfs
    Affects Versions: 0.18.0
            Reporter: dhruba borthakur
            Assignee: dhruba borthakur


When a client detects a error while writing to a block, it starts the 
generation-stamp-protocol to remove stale replicas. At the same time, if the 
namenode experiences a lease expiry event for that file, the namenode starts 
the generation-stamp-protocol for the same block. Now, the client and thr 
namenode ping-pongs trying to stamp the block replicas. This ping-pong can 
continue for a long time.

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